Libraries updates and cleanup

* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2

lib/libc/db/man/btree.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: btree.3,v 1.12 2010/03/22 19:30:53 joerg Exp $
+.\"	$NetBSD: btree.3,v 1.13 2012/10/13 15:28:33 njoly Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -225,7 +225,6 @@ for any of the errors specified for the library routine
 .Xr hash 3 ,
 .Xr mpool 3 ,
 .Xr recno 3
-.Pp
 .Rs
 .%T "The Ubiquitous B-tree"
 .%A "Douglas Comer"